So right off the bad 3.00x10^10 is a large value than a float 32 can hold since the limit there is 2^31-1 (~2.15x10^10), so you'll need to be using a float 64 to store that tag if those are the expected values. Typically the Zero and Span are manually set by a user entering them through Point Builder in System Management Tools (SMT) when creating a new tag.

I do know that the values are manually set, I think I did not formulate the question well. Do I need to write the value including the 10^10 or the whole value. Does the system recognises the 10^10 or E+10?

Ah, now I understand. You should be able to use scientific notation in those configuration fields (5E+09 = 5,000,000,000) without any issue. I also want to correct myself on my previous response, the max value for a float32 is actually (~3.40e38), but nonetheless I think that you should use a float64 pointtype for these points.